Combination perforating die and striking plate



Nova 5, 4 L. w. SIMISTER' A2226 GOMBINATION FERFORATING DIE AND STRIKINGPLATE Filed Feb. 16, 194@ INVENTOR. Zou/s SIM/575R.

ATTORNEY.

Patented Nov. 5, 1940 UNITED STATES PATENT OFFICE COMBINATIONPERFORATING DIE AND STRIKING PLATE and Carlton E. Knight ApplicationFebruary 16, 1940, Serial No. 319,187

5 Claims. (Cl. 164-93) This invention relates broadly to perforatingdies as used in the shoe industry and in kindred industries, and moreparticularly to a combination perforating die and striking plate.

Certain styles of shoes are embellished by perforatingornamental'designs in the upper or tip portions thereof.

Generally speaking, perforating dies as now commonly used for thispurpose consist of a base having therein upwardly extending tubes,blades or other plungers. Mounted thereon with springs is a stripperplate having openings therein corresponding with the tubes, blades,etc., of the base, and through which they are adapted to pass. Suspendedover each perforating machine is a roll of thick, card-board like paper,which is caused to be moved downwardly, so that a portion of the papercovers the perforating area of the die. The material to be perforated isplaced between the stripper plate and paper, the latter acting asstriking surface.

This arrangement has many disadvantages; th paper must be changed veryfrequently, costing considerable money when measured in terms of monthsand years; the die never contacts the paper twice in the same place, thevibration of the machine causes paper to move, which in turn will movethe material to be perforated, making it necessary to hold said materialin place by means of clips; cumbersome and. unnecessary parts must beadded to the perforating machine for holding and moving the paper; andoccasionally too, a less experienced operator will attempt to hold thematerial in place with his finger tips and, when they are not withdrawnin time, severe injury may, and occasionally does, result.

With this in view, it is the principal object of this invention tocompletely eliminate the use of paper as striking surface by providingthe commonly used perforating die having a base and stripper plate, witha second or striking plate, which is connected thereto, and betweenwhich and the stripper plate the material to be perforated is placed.

A further aim of the present invention lies in providing a second orstriking plate of copper, brass or other suitable material, sopositioned as to cover the perforating surface of the die, when inoperative engagement therewith.

A still further advantage resides in the provision of means forpositively preventing the material to be perforated from moving, thuseliminating the use of clips now needed to hold said material in place.

Yet another purpose is to provide a stripper plate and a striking platewith means for normally holding them apart, and providing the strikingplate with means for limiting its outward movement relative to thestripper plate.

These and other meritorious objects and advantages are accomplished bythe novel and practical combination of few and simple parts hereinafterdescribed and illustrated in the accompanying drawing, in which:

Figure l is a top plan View of a perforating die, showing the strikingplate secured thereto.

Figure 2 is a front elevational view of the device, the striking platebeing in its open or inoperative position; and

Figure 3 is a side elevational view showing, in solid lines, thestriking plate in an open or inoperative position, the dotted or brokenlines showing said plate partly closed.

Referring in greater detail to the drawing, the numeral It) indicatesgenerally a perforating die comprising a base or punch I l superimposedupon which and mounted thereon by springs is a stripper plate l2 havingopenings I4 therein. The openings l4 correspond with a series of tubes,blades or other perforators, which extend upwardly from the base II andwhich are arranged in ornamental design.

A striking plate [4, substantially rectangular in cross-section and of asize sufficiently large to cover the perforating area of the die when inclosed or operative position, and made of brass, copper-or othersuitable material corresponding to the tubes, blades or has indentationsl5 corresponding to the tubes, blades or other plungers of the die andmade by them in the course of perforating operations, is hingedlyconnected to the stripper plate l2 by means of a hinge 16, about thehinge pin of which is wound a spring l1, one leg of which pressesagainst the striking plate I4 andthe other leg of which presses againststripper plate forcing said striking plate normally away from saidstripper plate.

In order to limit the outward movement of said striking plate withrespect to said stripper plate, there is provided, alongside of andparallel with that leg of spring I! which presses against said strikingplate M, a substantially rectangular bar, one-half of which, as at I8,is secured to said striking plate, its other half 19 dependingtherebelow. The part l9 obviously acts as stopper for limiting theoutward movement of said striking plate l4 beyond an angle ofsubstantially 90". A guide bar 20 is provided on the upper part ofstripper plate l2, and a corresponding opening 2| is provided in saidstriking plate M to permit said bar to clear when said striking plate I4is in a closed or operative position. Bar 20 acts as gauge for materialto be perforated.

In operation, the material to be perforated is placed between saidstripper plate and said striking plate. Said striking plate will be openor angularly away from said stripper plate at that time. To prevent toogreat an outward movement of said striking plate, stoppers are providedto limit this movement.

After the material to be perforated has been placed upon the stripperplat-e, the die is entered into the perforating machine, causing thestriking plate to close over the material, holding it firmly in placeduring perforation. The die is then removed from the machine, which willcause said striking plate to move outwardly under the influence ofspring H to a point where stopper l9 will limit such' outward movement.After this has been done a few times, that is, after several perforatingoperations have been made, there will appear upon the inner face ofstriking plate [4 a series of indentations corresponding to theperforators of the die. These indentations will act as female cuttingelements,

There has thus been illustrated and described in its preferredembodiment a highly efficient combination of perforating die andstriking plate, by which it is intended to eliminate many of thedisadvantages of dies presently in use.

Although the foregoing is descriptive of the best known embodiment ofthe invention together with the matter of its operation, this isintended to be illustrative rather than limitative, andmany'modifications within the scope of the appended claims, withoutdeparture from the spirit of this invention.

Having thus described this invention, What is claimed as new and desiredto secure by Letters Patent is:

1. A die structure of the character described comprising, incombination, a die base, upright cutting elements supported thereby, aplate for said elements to out against, means connecting said plate withthe die structure for swinging movement relatively thereto into and outof cooperative relationship to said elements, and

means tending to swing said plate relatively to said die structure.

2..A die structure of the character described comprising, incombination, a die base, upright cutting elements supported thereby, aplate for said elements to cut against, means connecting said plate withthe die structure for swinging movement relatively thereto into and outof cooperative relationship to said elements, and means for limiting theswinging movement of said plate away from said cutting elements.

3. A die structure adapted for use in a perforating press comprising, incombination, a die base, upright cutting elements supported thereby, aplate for said'elements to out against, means connecting said plate withthe die structure for swinging movement up and down into and out ofcooperative relationship to said elements, and means for normallyholding said plate in an upper position for the introduction of the workbetween said plate and said elements, said means permitting the downwardswinging movement of said plate by its engagement with parts of theperforating press as the die structure is pushed into cutting positionin the press.

4. A die structure of the character described comprising, incombination, a die base, upright cutting elements supported thereby, aplate for said elements to out against, means hinging said plate to therearward portion of said die structure for swinging movement up and downinto and out of cooperative relationship'to said elements, a springassociated with said plate to hold it normally in an upper position, anda stop limiting the movement of said plate by said spring.

' 5. A perforating die structure comprising, in combination, a die base,upright perforating tubes mounted in said base, astripper associatedwith said tubes, 2. plate for said tubes to out against, meansconnecting said plate with the die structure for swinging movement upand down toward and from said tubes, and means for swinging said plate,said plate having a cutting surface of a material softer than thecutting edges of the tubes so that'it will not substantially dull thetubes when'they out against the plate.

' LOUIS W. Slit/ESTER.

